Ferrule for boiler tubes



May 22, 1923. v J. PEINKA FERRULE FOR BOILER T UBES Filed April 22 1912 Patented May 22, 1923.

NEE STeilflFifi eens JOSE]? PIEGINKA, OF DEUTSCI-I-WAGEAM, AUSTRIA.

FERRULE FOR BOILER TUBES.

Application filed April 22, 1912.

Serial No. 692,315.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L., 1313.)

T all 20 7mm it may concern Be it known that I, Josnr PnoINKA, a sub ject of the Emperor of Austria, and a resident of Deutsch-l/Vagram, Austria, have in vented certain new and useful. Improvements in Ferrules for Boiler Tubes (for which I have filed applications in Austria,

Apr. 24. 1911, Germany, May 8th, 1911, and

Great Britain on Jan. 2, 1912), of which 10 the following is a full, clear, and exact specification.

The known ferrules for boiler-tubes are seated generally inside the tubes that come flush with the front end of the boiler, and

therefore cause a narrowing of the mouth of the tube. Furthermore they require a special operation for securing them, as it is only by means'of screw threads, groovings. inserted wires or the like that they can be made tight and secured. Moreover the ferrules must be made of soft material, as otherwise they do not allow of the necessary treatment for securing and making them tight.

According to the present invention, on the contrary, the ferrules are situated outside of the tubes projecting from the front tube plate, and therefore engage them from the outside, so that they do not cause any change in the diameter of the tube. They are connected with the tube and secured thereto by rolling in the end of the tube, so that they may be made of hard, completely fire-proof material. No operation on the front tube plate of the boiler or of the tubes and especially of the ferrules is necessary in, any case. Finally, the rolling in of the end of the tube and of a packing ring into the ferrule can be effected in one operation. This is effected by securing the tube, and by rolling out the end of the tube into or with the casing. In place of the packing ring a protuberance or shoulder provided on the projecting end of the tube may be employed. 45 The essential characteristic of the invention is that the ferrules serve at the same time as means for holding the tubes. As a matter of course ferrules may be employed which embrace the ends of the tubes inside and outside. The narrowing of the tubular cross-section is however not so great as the thickness of the sides of the ferrule.

In the drawing a number of forms of the invention are illustrated,

Fig. 1 illustrates in four working stages 5 the arrangement in which brittle ferrules are employed.

1 is the front end of the boiler or the side of the fire-box 2 are the heating tubes, 3 the sleevelike ferrules made of fire-proof, hard material, which are formed with bores 4 and 5, and an internal circumferential groove 6. The outer boring 4t suitably corresponds to the inner width, and the inner 5 to the outer circumference of the flue tube 6 2. The groove 6 is limited by the tapered surface 7, along which the end of the flue tube is turned over. In the free space now created above the turned over end of the tube a ring of circular or angular crosssection is inserted, which may consist of. copper or other suitable soft yet tire-proof material.

For the insertion of the ring a suitable tool of a known kind is employed.

The turning over of the end tube and the insertion of the copper ring can be suitably effected in one operation by means of the rolling in tool.

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:

A. boiler tube ferrule comprising a cap of a refractory material provided with an inner circumferential groove having a tapering side wall provided with an annular recess for the reception of the correspondingly shaped end of the boiler tube protruding from the boiler, and a ring within. said annular recess for connecting the end of the tube within and with said ferrule, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

JOSEF PECINKA.

Witnesses IGNZ KNonrLMAoI-Inn, LENGEST Frueenr. 

